John m



@uitrit .i tetes genet @fitte JOHN M. HARVEY, 0 F BUCHANAN, VIRGINIA.v

Letters .Patent No. 72,489, dated .December 24, 1867. i

IMPROVEMENT IN STEAM-GENERATORS.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, JON M. HARVEY, offBuchanan, in the county ofBotetourt, in the State of Virginia, have invented a new and improvedSteam-Boiler.; anddo hereby declare that the following is a full andexact description thereof, reference being rnade to the accompanyingdrawings, and to the letters of reference marked thereon. l

The nature of my invention consists in the construction and arrangementof the herein-described Stearngenerator.

To ena-ble others skilled inthe art to make and use my invention, I willproceed to describe its construction and operation. I I

It consists in placing a boiler with a convex'bottom immediately overanother boiler with a concave top-or upper side, having a space ofvtwoand a half feet between them, when the boilers are not more thanthirteen feet in length. The boilers are connected by vertical pipes,or-semicircnlar ones, as may be preferred. A wall of irebriek closes upthe apparatus atthe sides. This wall is'built so as .to leave an openingbetween it and the boilers, sucient to let the ame permeate overand`aro'und the lower boiler, exceptthe grate-head, and on the upper tothe waterr line, (see drawing A.) The lower boiler is made shorter thanthe upper the depth of the v grate. An opening is made in the wall, inor near tothe centre of' the concave boiler, eightV by four inches, forthe purpose of' admitting atmospheric air at the point of the greatestcombustion, and isused for observing the action of the llame,andregulating it, (see B in drawing.) 'The end of concave boiler nextthe chimney is depressed to receive the regulator, formed out ofsoapstone, from two to three feet in length. This regulator -is'operated by a wheel and Shaft. On` the latter is placed a. short arm,and on the'wheel a chain, which extends to the fire man at the grate, bywhich the draught is increased or diminished, and by which a completereverberation is eiIected, (see C in drawing.) Y

What I claim as my invention, and desire to secure by Letters Patent, isy Y The construction and arrangement of the within-describedsteam-generator, in a manner substantially as shown.

JNO. HARVEY.

Witnesses:

' J. H. BINFGRD, C. P. BURKs`

